Problem with lost focus is still present in 745
In List view when file name uses almost all panel width after we delete the last file in the list, FC XE goes to previous file, BUT focus goes to parent folder ..
See new video demonstrating problem http://imgur.com/riUqEHS

I can't see the focus on the parent folder, are you sure? Perhaps it's lost, or it might be on the correct item, just the wrong column is displayed. Could you press the Up arrow key?

Sorry, I really described problem not quite right.
If in 745 we delete the last file in the list - it had number 90, FC XE goes to the previous file and focus goes to that file - it has number 89 - it's ok.
But after that something occurs and focus is lost and, as you can see on video, all jumps to the beginning of the panel - the first column is shown - it's bad.
If we press the Up arrow key all jumps to the end of the panel to the last column and focus goes from file with number 89 to file with number 88 - it's ok.

Same results when using the splitter bar quick viewer button instead of Ctrl+Q.
I still couldn't reproduce the problem when deleting the last item, but I think the problem is related, right item is focused, wrong column displayed, so perhaps fixing this issue could fix also the other one.